65 lines
2.0 KiB
Python
65 lines
2.0 KiB
Python
# Pyrogram - Telegram MTProto API Client Library for Python
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# Copyright (C) 2017-2019 Dan Tès <https://github.com/delivrance>
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#
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# This file is part of Pyrogram.
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#
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# Pyrogram is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Pyrogram is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with Pyrogram. If not, see <http://www.gnu.org/licenses/>.
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import logging
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from binascii import crc32
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from struct import pack, unpack
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from .tcp import TCP
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log = logging.getLogger(__name__)
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class TCPFull(TCP):
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def __init__(self, ipv6: bool, proxy: dict):
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super().__init__(ipv6, proxy)
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self.seq_no = None
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def connect(self, address: tuple):
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super().connect(address)
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self.seq_no = 0
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def sendall(self, data: bytes, *args):
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# 12 = packet_length (4), seq_no (4), crc32 (4) (at the end)
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data = pack("<II", len(data) + 12, self.seq_no) + data
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data += pack("<I", crc32(data))
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self.seq_no += 1
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super().sendall(data)
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def recvall(self, length: int = 0) -> bytes or None:
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length = super().recvall(4)
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if length is None:
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return None
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packet = super().recvall(unpack("<I", length)[0] - 4)
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if packet is None:
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return None
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packet = length + packet # Whole data + checksum
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checksum = packet[-4:] # Checksum is at the last 4 bytes
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packet = packet[:-4] # Data without checksum
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if crc32(packet) != unpack("<I", checksum)[0]:
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return None
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return packet[8:] # Skip packet_length (4) and tcp_seq_no (4)
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